2923-68-4 3,5,7,8-Tetrachloro-2,2,3,4,4,5,6,6,7,8,8-undecafluoroctanoic acid 3,5,7,8-Tetrachloro-2,2,3,4,4,5,6,6,7,8,8-undecafluorooctanoic acid CCRIS 4415